Stripper device

ABSTRACT

A stripper device for attachment to a movable part of a machine tool comprises a strip of resilient material secured to the movable machine part and terminating in a deflectable, exposed lip which is operable to wipe the surface of a fixed part of the machine tool. The lip is protected against damage by hot chips or the like by a layer of metal secured to the strip, the metal layer being sufficiently thin and flexible as to permit deflection of the lip in accordance with variations of the surface over which it moves.

A United States Patent Hennig et al.

[54] STRIPPER DEVICE [72] Inventors: Arnold Hennig, Erlenstrasse l0,

lsmaning 8045; Kurt Hennig, Georgensteinstrasse 16, 8000 Munich 71, bothof Germany [22] Filed: Jan. 28, 1971 [211 Appl. No.: 110,715

[30] Foreign Application Priority Date Feb. 3, 1970 Germany ..P 20 04741.0

[52] US. Cl. ..l5/256.5, 160/202, 308/35 [5 l] lnt. Cl. ..F16c 17/00[58] Field of Search ..308/3.5; 160/11, 202, 193, 160/223; 161/217, 216,213, 403, 404;

[56] References Cited UNITED STATES PATENTS 3,030,692 4/1962 Raynes..308/3.5

[451 Sept. 19, 1972 3,515,444 6/1970 Grabner ..308/3 .5

FOREIGN PATENTS OR APPLICATIONS 63,883 5/1955 France ..308/3.5

Primary Examiner-Leon G. M-achlin Att0rney-Learman & McCulloch [57]ABSTRACT A stripper device for attachment to a movable part of a machinetool comprises a strip of resilient material secured to the movablemachine part and terminating in a deflectable, exposed lip which isoperable to wipe the surface of a fixed part of the machine tool. Thelip is protected against damage by hot chips or the like by a layer ofmetal secured to the strip, the metal layer being sufficiently thin andflexilble as to permit deflection of the lip in accordance withvariations of the surface over which it moves.

10 Claims, 2 Drawing Figures ll/l/l STRIPPER DEVICE This inventionrelates to a stripper device, especially for chips and dust, forattachment to a movable part of a machine. tool, especially to a machinecomponent movable along a slide track or to telescopically engageablecasing members, and having a resilient strip disposed transversely tothe direction of movement of the machine component, affixed by a rigidmetallic holder to the machine component, and terminating in a stripperlip lying on the slide track or the adjacent casing members.

Stripper devices of the above type are known wherein the rigid metallicholder used for affixing the resilient strip comprises a relativelythick sheet metal strip which is attached to the machine component byscrewing, riveting or welding. The leading edge of the resilient strip,which tapers in wedge fashion and constitutes the actual stripper lip,is thus completely free. Though it therefore has the resilience neededfor effective stripping, it is to a considerable extent subject toattack by hot chips, which results in rapid wear.

. Stripper devices of the type in question are also known wherein theholder for the resilient strip comprises a steel plate which is drawn inthe form of tongues, separated by slots, over the upper side of the lip.These tongues are intended to increase the springiness of the stripperlip and also to provide some protection for the lip. In practice,however, it is found that this known stripper device does not meeteitherof these latter requirements to a satisfactory extent. In orderthat the steel plate, which is also used as the holder, should have thestiffness needed for attachment, the plate chosen should not be toothin. Consequently, the springiness of the tongues extending from thisplate and lying on the left top of the strip is very limited. Also theslots necessarily provided between the tongues enable hot chips to comeinto contact with the top and leading edge of the lip.

A stripper device is also known wherein in order to protect the stripperlip, the sheet metal strip which also acts as a holder is forwardlyadvanced over the lip, and under this advanced portion of the metalstrip the lip has a cut-away portion which permits resilient movement ofthe stripper lip perpendicular to the slide track. Because of thiscut-away portion the stripper lip has a relatively large height, andconsequently the front edge of the sheet metal strip also lies fairlyhigh above the slide track. Consequently, this known stripper deviceagain has the danger that hot chips can come into contact with thestripper lip (i.e., with its leading edge).

The object of the invention is therefore to avoid these disadvantages ofknown constructibns while providing a stripper device of the kinddescribed which provides firstly a full protection of the stripper lipfrom attack by hot chips and secondly, ensures adequate elasticity inthe lip. According to the invention this object is achieved in that theupper side of the lip is provided with a metallic protective layer whichis separate from the rigid metallic holder and from the part of theelastic strip which is thereby made rigid, and is so thin and flexiblethat it does not hinder the movements and deflections of the stripperlip caused during operation.

In distinction from all previously known stripper devices, in the deviceprovided by the present invention the metallic layer provided forprotection of the lip surface thus has no connection with the rigidmetal holder used for affixing the strip, or with the part of theelastic strip immobilized by this holder. Consequently, the saidmetallic protective layer can freely follow the individual movements ofthe stripper lip, especially since the layer in accordance with theinvention is made thin and flexible. In this way there is ensured botheffective protection of the stripper lip against attack by hot chips(because of the rapid removal of heat caused by the metallic protectivelayer) and the required inherent resilience in the stripper lip.

According to the invention, the metallic protective lip may comprise athin metal sheet fixedly attached by vulcanizing, sticking or othermethod to the resilient material, preferably consisting of plastic. Itmay be especially advantageous to make this sheet from spring steel,since this further reinforces the elasticity of the stripper lip.

In accordance with the invention, it is, however, also possible to makethe metallic protective layer by casting, spraying or vapor deposition.Any of the modern methods may be used whereby thin layers of metal areapplied to plastics (or vice versa). In order to achieve especially goodheat removal it can be advantageous to apply the protective metalliclayer to a surface of the elastic material which has for instance beenribbed, roughened or in any other manner increased.

Two embodiments of the invention are shown schematically in thedrawings.

The part 1, indicated only schematically, of a machine tool (FIG. 1)reciprocates in a horizontal direction (arrow 2) on a slide track 3(parts 1 and 2 may also be telescopically engageable casing members). Inorder to strip away chips, dust particles and the like foreign bodieswhich may be on this slide track, there is used a stripper device whichconsists of a resilient strip 4 and a rigid metal holder 5.

The metal holder 5 is a relatively thick sheet (for example of brass)connected, for instance by vulcanizing, to the strip 4 consisting ofresilient plastic such as polyurethane, polyethylene, polyvinylchloride, or the like. The stripper device consisting of parts 4 and 5is connected to the machine part 1, for example by welding. 1

The elastic strip 4 consists of a rear portion 6 intended for attachmentto the holder 5 or as an additional support, a tongue 7 sewing forfurther improvement of the attachment, and the actual stripper lip 8which has a wedge-shaped forward taper and has its leading edge lying onthe slide track 3.

In accordance with the invention the upper side of the stripper lip 8 isprovided with a protective metallic layer 9 of spring steel or the like,which is made thin and flexible and is not connected to the rigid metalholder 5. This protective layer 9 prevents any damage to the stripperlip 8 from impinging hot chips. However, it also permits free resilientdeflection of the stripper lip 8, and in particular does not hinderpivotal movements of the stripper lip 8 about the latters position ofconnection to the metal holder 5.

In the further embodiment of the invention shown in FIG. 2, the stripperdevice is attached, for instance by a screw connection 10, to avertically disposed machine part 1'. In this case, the rigid metalholder 5', consisting of thick sheet metal, is vulcanized into theelastic strip 4' formed of material similar to that of the strip 4. The

strip 4' has its portion 6 lying against the machine part 1'.

In this embodiment, the upper side of the stripper lip 8' is againcovered by a thin, flexible, spring steel or other metallic protectivelayer 9, which in view of the shape of the stripper lip 8 is extendeddownwards to near the under edge of the stripper lip 8. From themanufacturing aspect this can be produced by vulcanizing, sticking orotherwise attaching a thin metal sheet to the plastic, or by simplyspraying on the metallic protective layer or depositing it from vapor.in this embodiment the metallic protective layer 9 is again notconnected to the rigid metal holder The stripper lip 8' can consequentlymove freely about its connection point.

We claim:

1. A stripper device adapted for connection to a movable part of machinetool or the like, said device comprising a strip of resilient materialterminating at one end in a deflectable lip having an outer surface;means for mounting said strip on said part with said surface exposed;and a layer of metal overlying substantially the whole of said surfaceand secured to said surface of said lip, said metal layer beingsupported only by said lip and being sufficiently thin as to be flexiblein response to deflection of said lip.

2. The construction set forth in claim 1 wherein said mounting means isrigid.

3. The construction set forth in claim 1 wherein said surface is ribbed.

4. The construction set forth in claim 1 wherein said surface isroughened.

5. The construction set forth in claim 1 wherein said layer of metal issecured to said surface by vulcanizing.

6. The construction set forth in claim 1 wherein said layer of metal issecured to said surface by spraying.

7. The construction set forth in claim 1 wherein said layer of metal issecured to said surface by coating.

8. The construction set forth in claim 1 wherein said layer of metal issecured to said surface by vapor deposition.

9. The construction set forth in claim 1 wherein said strip is composedof plastic material.

10. The construction set forth in claim 1 wherein said metal comprisesspring steel.

1. A stripper device adapted for connection to a movable part of machinetool or the like, said device comprising a strip of resilient materialterminating at one end in a deflectable lip having an outer surface;means for mounting said strip on said part with said surface exposed;and a layer of metal overlying substantially the whole of said surfaceand secured to said surface of said lip, said metal layer beingsupported only by said lip and being sufficiently thin as to be flexiblein response to deflection of said lip.
 2. The construction set forth inclaim 1 wherein said mounting means is rigid.
 3. The construction setforth in claim 1 wherein said surface is ribbed.
 4. The construction setforth in claim 1 wherein said surface is roughened.
 5. The constructionset forth in claim 1 wherein said layer of metal is secured to saidsurface by vulcanizing.
 6. The construction set forth in claim 1 whereinsaid layer of metal is secured to said surface by spraying.
 7. Theconstruction set forth in claim 1 wherein said layer of metal is securedto said surface by coating.
 8. The construction set forth in claim 1wherein said layer of metal is secured to said surface by vapordeposition.
 9. The construction set forth in claim 1 wherein said stripis composed of plastic material.
 10. The construction set forth in claim1 wherein said metal comprises spring steel.